Remote task scheduling for a set top box

ABSTRACT

Systems and methods for remotely scheduling tasks that are transmitted to a set top box and implemented on the set top box. A task service includes a website that provides program guide data to users. From the program guide data, a user selects a task. The website generates a notification that includes the task and certain identifiers, including a set top box identifier and a sequence number. The notification is sent to a notification service, that repeatedly sends the notification to a broadcast service. The broadcast service ensures that the notification is transmitted to the set top box. The set top box detects the notification from the set top box identifier and implements the task on the set top box unless the task: has been previously handled.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.09/968,486, filed Oct. 1, 2001, now U.S. Pat. No. 7,107,608, entitled“REMOTE TASK SCHEDULING FOR A SET TOP BOX”, and which is incorporatedherein by reference.

BACKGROUND OF THE INVENTION

1. The Field of the Invention

The present invention relates to systems and methods for remotelyscheduling tasks for a set top box. More particularly, the presentinvention relates to systems and methods for remotely requesting tasksand for remotely scheduling tasks that are transmitted over a satellitesystem to a set top box.

2. Background and Related Art

Consumers are beginning to have access to a large number of televisionprograms over an increasing number of television channels. Set top boxessuch as satellite receivers, cable boxes, and digital video recorders orcombinations thereof are becoming more popular because they providefeatures to consumers that were not previously available. Set top boxes,for example, allow users to digitally record programming content such astelevision programs, lock certain channels from being accessed withoutpermission, view electronic program guide data, and set personalpreferences that control how the program guide data and/or theprogramming content is presented to the user.

These features are available to a user who, from the comfort of theirown home, can easily program the set top box to perform these tasks. Theability to digitally record a television program is particularly usefulwhen users are unable to view a particular television program during thescheduled broadcast of the program. For example, there may be more thanone program that the user wants to watch that are broadcast at the sametime, or the user may be away from home when the program the user wantsto watch is broadcast.

Sometimes, the user knows that he or she will be unable to view acertain television program well in advance. This may occur, for example,when the user is planning a vacation. In this instance, the user is ableto directly program the set top box from their home to record theprogram before they leave on vacation. When the program is broadcastwhile the user is on vacation, the television program will be recordedby the programmed set top box and the user will be able to view theprogram at their leisure.

Unfortunately, there are situations where the user is away from home andtheir set top box is not programmed to record a certain program. A user,for instance, may leave on vacation without programming their set topbox. In other situations, a user may desire to record a program shortlybefore the program is scheduled to begin. For example, a user, while ata sporting venue, may discover that their favorite program is going tobe a new episode instead of a repeat episode.

More generally, there are many reasons why a user is unable to record atelevision program. The fact that the user may be at work, cannot gethome in time to record the television program, has another commitmentthat conflicts with the television program, forgot to program the settop box, and the like are some of the reasons that prevent a user fromsuccessfully recording a program. Thus, users often find themselves insituations that prevent them from successfully recording the desiredprogram.

In order to schedule a task, such as recording a television program,many set top boxes simply require the presence of the user. Thus, usersare unable to access their set top boxes from a remote location suchthat a task can be scheduled at the set top box. Attempts have beenmade, however, to provide a way for users to record programs or scheduletasks when they do not have direct access to their set top box.

One attempt involves using a proprietary server that stores programguide data. Periodically, the set top box will access the proprietaryserver in order to update the program guide data stored in the set topbox. To schedule a task in this case, the user accesses the proprietaryserver through a network, such as the Internet. Once logged on to theproprietary server, the user may view the program guide data stored onthe proprietary server and input programming instructions or schedule atask that will be downloaded to the set top box of the user.

The primary problem is that the set top box can only access theproprietary server periodically, which may introduce a large delay intothe creation of a task. The user must simply wait until the set top boxlogs in at a later time before the task will be downloaded. In manycircumstances, especially when a task is scheduled on short notice, theset top box will not record the television program because it either didnot receive the task or received the task too late.

The problem of ensuring that a user is able to remotely schedule a taskis also complicated because many of the broadcasts through whichtelevision programming is delivered are unidirectional transmissions. Asatellite, for example, does not receive data from a set top box.Rather, the satellite is broadcasting programming content that can bereceived by all of the set top boxes that are tuning to the satellite'sbroadcast. The lack of a return channel eliminates the possibility ofremotely accessing the set top box.

While many set top boxes have a dial up connection that, in many cases,serves as a return channel, the user is not able to remotely cause theset top box to establish the return channel. The set top box is able toreceive data over the satellite broadcast, but the dial up connection isonly used as needed. Thus, there is a need in the art for systems andmethods that allow a user to remotely schedule tasks that can beimplemented on a set top box.

SUMMARY OF THE INVENTION

These and other problems are addressed by the present invention whichprovides systems and methods for remotely scheduling tasks that areimplemented on a set top box. Remotely scheduling a task begins with atask service that allows a user to access program guide data using anaccess device. After the task selected by the user has been received bythe task service, the task is transmitted to a set top box over a systemsuch as a satellite system. The set top box detects the transmitted taskand implements or schedules the task on the set top box.

The task service maintains program guide data that is often provided tousers from a website that users may access over a network such as theInternet. The task service also provides users with access to programguide data over an automated, voice activated telephone system. A useris able to select or schedule a task, such as a record task, using theprovided program guide data from the website or from the telephonesystem. After the task is scheduled or identified at the task service,the task service generates a notification that includes the datarequired to effectively identify or define the task. The notification isthen broadcast or sent to the set top box over a transmission such assatellite broadcast. A notification service resends the notificationaccording to a pre-determined schedule to insure that the notificationis received by the set top box.

The set top boxes that receive the broadcast detect the notification asit is broadcast over the satellite broadcast by examining or detecting aset top box identifier included in the notification. The set top box,however, only pays attention to those notifications that are intendedfor that set top box, which is determined by the set top box identifier.The relevant notifications are processed by the set top box such thatthe task is scheduled on the set top box. Because the notifications arerepeatedly sent to the set top box, a sequence number is typicallyincluded in the notification such that the set top box can determinewhether the task has already been processed. In this manner, a user isable to remotely schedule a task that will be implemented or scheduledon his or her set top box.

Additional features and advantages of the invention will be set forth inthe description which follows, and in part will be obvious from thedescription, or may be learned by the practice of the invention. Thefeatures and advantages of the invention may be realized and obtained bymeans of the instruments and combinations particularly pointed out inthe appended claims. These and other features of the present inventionwill become more fully apparent from the following description andappended claims, or may be learned by the practice of the invention asset forth hereinafter.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to describe the manner in which the above recited and otheradvantages and features of the invention can be obtained, a moreparticular description of the invention briefly described above will berendered by reference to specific embodiments thereof which areillustrated in the appended drawings. Understanding that these drawingsdepict only typical embodiments of the invention and are not thereforeto be considered to be limiting of its scope, the invention will bedescribed and explained with additional specificity and detail throughthe use of the accompanying drawings in which:

FIG. 1 illustrates an exemplary set top box in which the systems andmethods of the present invention may be implemented;

FIG. 2 is a block diagram that illustrates how a remote task isgenerated and delivered to a set top box where it is implemented; and

FIG. 3 is a block diagram that illustrates a task service for remotelyrequesting and scheduling a task.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention relates to systems and methods for remotelyscheduling a task that can be scheduled on a set top box or on a clientsystem. In particular, the present invention allows users to access awebsite that provides program guide data and request a task using theprovided program guide data. The task, after it has been remotelyrequested or scheduled, is communicated to the set top box using, forexample, satellite bandwidth, or other network connections such asEthernet. The set top boxes detect the notifications and implement theremotely requested tasks.

The embodiments of the present invention may comprise a special purposeor general purpose computer including various computer hardware, asdiscussed in greater detail below. Set top boxes that enhance thecapabilities of conventional televisions represent an example of aspecial purpose computer. Exemplary set top boxes include, but are notlimited to, satellite receivers, cable boxes, digital video recorders,video cassette recorders, and the like and any combination thereof.Thus, a satellite receiver coupled with a digital video recorder, asseparate boxes or as an integral unit, is within the scope of a set topbox. The embodiments may further comprise multiple computers linked in anetworked environment.

Embodiments within the scope of the present invention also includecomputer-readable media for carrying or having computer-executableinstructions or data structures stored thereon. Such computer-readablemedia can be any available media that can be accessed by a generalpurpose or special purpose computer. By way of example, and notlimitation, such computer-readable media can comprise physical storagemedia such as RAM, ROM, EEPROM, CD-ROM or other optical disk storage,magnetic disk storage or other magnetic storage devices, or any othermedium that can be used to carry or store desired program code means inthe form of computer-executable instructions or data structures and thatcan be accessed by a general purpose or special purpose computer. Wheninformation is transferred or provided over a network or anothercommunications connection (either hardwired, wireless, or a combinationof hardwired or wireless) to a computer, the computer properly views theconnection as a computer-readable medium. Thus, such a connection isalso properly termed a computer-readable medium. Combinations of theabove should also be included within the scope of computer-readablemedia. Computer-executable instructions comprise, for example,instructions and data which cause a general purpose computer, specialpurpose computer, or special purpose processing device to perform acertain function or group of functions.

The invention will be described in the general context ofcomputer-executable instructions, such as program modules, beingexecuted by set-top boxes or other computers. Generally, program modulesinclude routines, programs, objects, components, data structures, etc.that perform particular tasks or implement particular abstract datatypes. Computer-executable instructions, associated data structures, andprogram modules represent examples of the program code means forexecuting steps of the methods disclosed herein. The particular sequenceof such executable instructions or associated data structures representsexamples of corresponding acts for implementing the functions describedin such steps.

The present invention is described herein with reference to a satellitesystem or other systems that have a one way transmission, broadcast orcommunication channel, but can be applied in other systems includingcable television systems where a bi-directional transmission orcommunication channel may exist.

FIG. 1 is a block diagram that generally illustrates a set top box thatis used in a satellite system. In this, example, a single satellite 160is illustrated, but it is understood that other satellites may beavailable and that the set top box 100 can receive broadcasts fromdifferent satellites. The satellite 160 typically has several broadcastfrequencies or transponders. The number of channels that are assigned toeach transponder is dependent on many factors, including, but notlimited to, the image quality, the frame rate of the source material,the amount of movement in the source material, the amount of errorcorrection overhead, and the like.

In addition to carrying multiple channels, the broadcast of eachtransponder may include electronic programming guide data, conditionalaccess data, and other digital data. The broadcast of the satellite 160is received at the set top box 100 and processed such that the data orchannels may be viewed on the display device 150, which is usually atelevision set.

In this example, the set top box 100 includes a tuner unit 102 and atuner unit 104. Each tuner unit typically includes a tuner, ademodulator, and a transport. The tuner tunes to a particulartransponder of the satellite 160 to receive the corresponding broadcastor programming content of the particular transponder. The demodulatorproduces a transport stream, which typically represents multiplechannels, from the tuned broadcast. The transport stream typicallyincludes audio, video and data packets for multiple channels but mayalso include program guide data, conditional access data, and the like.The transport separates a single video stream or channel from thetransport stream. Each tuner unit may be used to view a particularchannel.

The set top box 100 also includes a storage device 110. After a videostream or channel is produced, it can be rendered on the display device150 and/or recorded on the storage device 110. Because the set top box100 has more than one tuner, it is possible that one channel or programcan be displayed on the display device 150 while another channel orprogram is being recorded on the storage device 110. The second tunercan also tune to a transponder over which remotely requested orscheduled tasks may be received.

The present invention can be practiced in set top boxes that have asingle tuner, but it is useful to have an additional tuner in the settop box. One reason is that an additional tuner can more easily tune tothe transponder that carries remotely scheduled tasks. A tuner that isused while watching a program cannot tune to the appropriate transponderand it is therefore possible that a remotely requested task will not bescheduled because it was not detected by the set top box.

The storage device 110 is also used to store program guide data 112. Theprogram guide data 112 may be included in the broadcast of the satellite160, but it can also be received through, for example, a dial upconnection through a network such as the Internet. In either case, theprogram guide data 112 stored locally on the set top box 100 is usuallyspecific to the set top box 100. In other words, the program guide data112 may be related to any subscriptions of a user as well as to any userpreferences that have an effect on how the program guide data 112 isstored and/or displayed.

Program guide data typically includes information about the programs andchannels being broadcast by the satellite 160. Program guide data 112may include, but is not limited to, program start times, program endtimes, program durations, program ratings, program reviews, programdescriptions, program titles, program show dates, and the like. Theprogram guide data 112 also serves as a schedule for programs that willbe broadcast in the future and is similar to a program listing that maybe found in newspapers, for example.

As used herein, “task” refers to actions that occur or may be scheduledon a set top box and include, but are not limited to, recording aprogram, deleting a program, setting preferences, changing or alteringexisting tasks, locking a channel and/or a program, and the like. Tasksare implemented at the set top box and can occur immediately or can bescheduled to occur at a later time. Task also refers to events oroperations that are scheduled to be performed by the set top box.

FIG. 2 is a block diagram that illustrates an exemplary system in whicha user may remotely schedule a task for a set top box. In order toschedule a remotely requested task, the set top box 100 is first enabledto receive and process remotely requested tasks. Enabling the set topbox 100 often requires the user to register with a task service 210 or awebsite 216 such that the user receives a user identifier. Duringregistration, the user will also supply a set top box identifier to thetask service 210, such as a serial number or other identifier that isunique to the set top box. Alternatively, a user can use a useridentifier that is issued from an authentication service that uniquelyidentifies the user to many different websites.

When the task service 210 is accessed over the telephone, a useridentifier will be entered that may be different from the useridentifier supplied by the authentication system. For example, the useridentifier in this instance may be a telephone number of the userbecause the telephone number can also uniquely identify the user and/orthe user's set top box. Thus, the principles discussed herein can beapplied to a system where the task service is accessed by telephoneinstead of over a network such as the Internet.

The set top box identifier is stored by the task service 210 and is usedby the task service when a task is requested or scheduled as will bedescribed later. After the set top box 100 is enabled, the set top box100 has the ability to accept remotely generated or scheduled tasks,such as record tasks. After accepting a remotely scheduled task, the settop box 100 schedules the task and in some instances, performs conflictresolution while scheduling the task at the set top box 100.

Remotely scheduling a task begins with the task service 210 thatincludes a website 216. The website 216 is a website that providesprogram guide data to users or subscribers. Usually, the program guidedata is accessed over a network such as the Internet. Accessing thewebsite 216 typically requires a user identifier (such as a user nameand/or a password) that was obtained, for example, when the set top box100 was enabled for remotely scheduled tasks.

A user can access the website 216 and have the program guide dataprovided by the website 216 displayed on their access device 218, whichmay be a desktop computer, a laptop computer, a cellular telephone, anInternet appliance, and the like. The program guide data that isprovided by the website 216 to a user is often customized by the userand/or dependent on a subscription plan of the user.

FIG. 2 further illustrates an example of how the program guide data maybe displayed to a user. The program guide data 223 is usually displayedin a table format, but it is understood that the format will be changedto accommodate the display capabilities of the access device 218. Inthis example, a row 222 displays a time that indicates when a particularprogram will occur. The program guide data 223 displayed to a user alsohas a column 224 that identifies the channel that is showing the variousprograms during the times indicated by the row 222.

The user is able to use the program guide data 223 displayed on theaccess device 218 to remotely select, request or schedule a task. Inthis example, the program 225 has been selected, for example by a mouseclick, and is shaded. In this example, multiple task buttons,represented by a task button 221 and a task button 220, are presented tothe user. For example, the task button 220 may be a record button that,when selected or clicked by a user, would ultimately cause the program225 to be recorded by the set top box 100. Alternatively, the taskbutton 221 could be a delete button that -would cause the selectedprogram 225 to not be recorded on the set top box 100. Typically, a taskbutton is presented to the user for each potential task that can beselected or requested using the program guide data that is displayed onthe access device 218. Alternatively, a user has the option ofscheduling a manual record task. In this instance, the user can identifya start time, an end time, and a channel to be recorded. It isunderstood that tasks can be identified in other ways from the datapresented by the website 216.

Remotely scheduling a task thus begins when a user retrieves programguide data from the website 216. After the user has selected orscheduled a task using the program guide data that is displayed on theaccess device, the selected or requested task is sent back to thewebsite 216. Next, the website 216 generates a notification 214A that issent to a notification service 212.

The notification 214A, which represents the task selected or scheduledby a user, is usually sent to the notification service 212 usingstandard protocols and XML. The content of the notification 214Areflects the task that was scheduled or selected by the user. Forexample, a notification 214A may include or identify a time, a channel,and a duration of the task. These attributes can usually be determinedautomatically by the website 216 as they are inherent in the programguide data 223. For example, if a user selects the program 225, thetime, channel, and duration of the program 225 are known. In someinstances, the task is not limited to the length of a particularprogram, but the user can manually designate a duration.

The notification 214A may also include other information that is used todescribe attributes of the remotely scheduled task. The attributes canbe set to default values or can have no effect unless indicated by theuser. For example, the notification can identify an extension attribute,which indicates how long the task should be extended beyond thescheduled end time. This may be useful, for example, when recording asporting program, which does not usually conform to a pre-determinedduration or to the duration indicated by the program guide data 223. Abaseball game, for example, may extend into extra innings. Anotherattribute is a keep attribute that identifies how long the task shouldbe stored by the set top box. In one example, this provides anexpiration time for the task.

Another attribute is a conflict resolution attribute. For example, it ispossible that the task being sent to the set top box 100 will conflictwith a task that is already scheduled. The conflict resolution attributecan be used to determine how to handle a conflict between the taskcurrently being scheduled and any previously existing tasks. There isalso an destination attribute that indicates where the task shouldoccur. For example, a user may have both a VCR and a DVR and thedestination attribute can be used in a record task to designate whichset top box will record the program identified by the task. Anotherattribute is a reminder attribute that enables the set top box to scrolldata across the screen as a reminder to the user that their program isbeing shown but not recorded, thus providing a reminder to the userabout whether or not to record the program, for example.

Because a satellite broadcast is typically transmitted to multiple settop boxes, a set top box needs to be able to identify thosenotifications that are intended for that set top box. This isaccomplished by including identifiers in the notification that can berecognized by the set top box. Thus, unique user identifiers, set topbox identifiers, or other identifiers can be used to ensure that theappropriate set top box receives its notifications. In one example, thenotification 214A, in addition to identifying and defining the selectedtask, also includes a set top box identifier and a sequence number. Whena user logs on or accesses the website 216, a user identifier issupplied to the website 216 (by either the user or an authenticationservice) and the set top box identifier is determined by mapping theuser identifier to the set top box identifiers that are stored in adatabase 215 that is maintained by the website 216. This allows thewebsite 216 to include the appropriate set top box identifier in thenotification 214A such that the task will ultimately be scheduled by theintended recipient of the notification 214A.

After the set top box identifier has been determined, the set top boxidentifier is added to the notification 214A that is delivered to thenotification service 212. The website 216 also includes a sequencenumber in the notification 214A that is used by the set top box todetermine, for example, if the task has already been processed by theset top box 100. Each unique task receives a different sequence number.The website 216 packages these identifiers (the set top box identifierand the sequence number) with the notification 214A and sends thenotification 214A to the notification service 212. In some instances,the box identifier and/or the sequence number are encrypted as well.Alternatively, the set top box identifier and/or the sequence number canbe inserted into the notification 214A by the notification service 212instead of the website 216. In some instances, the user identifier isalso included in the notification. In other instances, only the set topbox identifier is included in the notification.

The notification service 212 stores all of the notifications receivedfrom the website 216 in a database. The notification service 212 isresponsible for sending the notifications to a broadcast service 200,which delivers the notification 214B (which is the same as notification214A but is numbered differently for clarity) to the satellite uplink202. The satellite uplink 202 integrates the notification 214B into thedata that is sent to the satellite 160 which, in return, broadcasts thenotification 214B to the set top box 100.

As previously stated, the set top box 100 has two tuners and the set topbox 100 is therefore capable of tuning to two transponders of thesatellite 160 simultaneously. In this example, the notification 214Bwill be sent over a particular transponder of the satellite 160 and oneof the tuners will tune to this transponder in order to receive thenotification. The notification service 212 will resend the notification214B according to a pre-determined schedule. This is advantageousbecause it is possible that neither of the tuners will be tuned to thecorrect transponder at a given time. Repeatedly sending thenotifications increases the likelihood that the set top box will receiveand process the tasks that are included in the notifications.

Alternatively, it is possible to replicate the remotely scheduled taskson all transponders. This ensures that the set top box receives theremotely scheduled task even if the tuner is tuned to audio and video.The transponder tuned by the second tuner is dependent on how theremotely scheduled tasks or notifications are transmitted in thesatellite system. For example, the remotely scheduled task(notification) can be sent on a particular transponder, in which casethe second tuner will tune to that transponder according to apredetermined schedule (every hour, every 2 hours, etc.) If the tasknotification is sent all transponders, then the second tuner may moreeasily detect the task notification.

The notification 214B can be sent by the notification service 212according to a pre-determined schedule, at constant intervals, or otherschemes and schedules. For example, the notification service 212 maysend the notification 214B to the broadcast service 200 immediatelyafter it is received from the website 216. The notification service 212may then resend the notification 214B according to the followingexemplary schedule: after two minutes, after four minutes, after 8minutes, after 16 minutes, and the like until the task expires or for apre-determined time period. Instead, the notification can be sent every5 minutes until the task in the notification expires or for apre-determined time period. Alternatively, the frequency or schedulewith which a notification is sent may also increase as the start timefor a particular task approaches. In general, any scheme or schedule canbe implemented with regard to how often the notifications are sent bythe notification service 212.

In any case, the notification 214B is repeatedly resent to provide moreassurance that the set top box 100 receives the task that is packaged inthe notification 214B because it is possible that none of the tuners ofthe set top box are tuned to the appropriate transponder. For eachnotification, there is usually a point where the notification service212 ceases to resend the notifications. For example, the notificationscan expire or the task included in the notifications may become invalidbecause the program associated with the task has already finished.

After the tuner unit 102 tunes to the transponder that carries thenotifications, the task detector 106 is responsible for identifyingtasks or notifications that are intended for the set top box 100. Aspreviously indicated, each notification contains a sequence number and aset top box identifier. The sequence number is different for differenttasks, but notifications that are repeated for a particular task retainthe same sequence number. Thus, the original notification for a certainrecord task has the same sequence number as do the notifications thatare repeats of the original notification. The sequence number changeswhen the task changes or when a new task is requested. This allowsunique tasks or notifications to have a unique combination of thesequence number and the set top box identifier. If the notification doesnot include the sequence number, then the task may be processed multipletimes at the set top box.

The task detector 106 thus filters the tuned broadcast according to theset top box identifier and/or the sequence number. When the taskdetector 106 of the set top box 100 detects a notification, then thetask in the notification is scheduled by the task manager 108. If theset top box filters a notification that has already been scheduled asdetermined from the set top box identifier and the sequence number, thenthat notification is ignored because it is a repeat of a previousnotification that has already been processed by the set top box 100.

The task detector 106 may also filter by attributes or other data. Thisis useful, for example, when a notification is being sent to a group ofset top boxes (federation). All of the set top boxes in the federationwill be able to process the task in this instance. For example, the settop box users may express interest in a particular program. Thenotification can be addressed to this federation such that the programin which interest was expressed is recorded as described herein.Alternatively, other tasks can be remotely scheduled for a federationusing attributes, telephone numbers, cities, and the like.

The task detector 106 can also filter according to other factors thatare related to enabling the set top box 100. One factor is whether theuser has a subscription to use this capability of remotely schedulingtasks. If the subscription plan of the user does not include remotelyscheduled tasks, then the task detector 106 is effectively disabled.Another factor is whether the user has enabled the ability to remotelyschedule tasks by affirmatively declaring that he or she wishes toreceive remotely scheduled tasks.

In some instances, the user is required to have more than one tuner,although the systems and methods described herein can be implemented ona single tuner, but it is more difficult to ensure that the set top boxwill schedule the task because a single tuner may not be able to tune tothe appropriate transponder and/or there may not be enough bandwidth onother transponders to include the task.

Assuming that the user has a subscription and that the user has enabledremote tasks, although neither aspect is required for the presentinvention, the task detector 106 examines the broadcast from thesatellite 160 looking for the notifications that are intended for theset top box 100. The notifications that have the correct set top boxidentifier are handled or processed by the task manager 108 andscheduled or implemented.

FIG. 3 is a block diagram that illustrates a task service that permits atask to be prepared or requested for implementation or scheduling on aset top box. After a user has logged on to the task service 210, thetask service (or a website) provides (300) program guide data to theuser over a network such as the Internet. The user is able to select orrequest a task using the provided program guide data and the request orthe selected task is received (302) by the task service 210 from theuser.

From the requested task, a notification is generated (304) and thenotification includes information that is needed by the set top box toimplement or schedule the task. A notification module 305 is usedgenerate the notification in part by inserting attributes (306) andidentifiers (307) in the notification. Some of the attributes, such as achannel, a time, and a duration can be determined from the selected taskbecause they are inherent in the program guide data and are discoveredas the user requests the task. Other attributes, however, may have to besupplied by the user and these attributes are may also be included inthe notification. Alternatively, the task may be a cancel task, in whicha previously created record task or other task is canceled. In thisinstance, the user may simply identify the previously created recordtask and select cancel.

The notification module 305 inserts, for example, a set top boxidentifier, a sequence number, and/or a user identifier in thenotification. The set top box identifiers are stored in a database thatmay be accessed by either the website or by a notification service. Thedatabase can be a part of the task service or can be remotely locatedfrom the task service such that the set top box identifiers areretrieved over a network, for example. When a set top box identifiers ismaintained or retrieved by the website, the set top box identifier thatis associated with a user identifier is included in the notificationthat is sent to the notification service by the website. A sequencenumber is also included in the notification. In this case, thenotification service is responsible for causing the notification to berepeatedly sent to a broadcast service according to a schedule.

Alternatively, the notification service may be responsible formaintaining or accessing the database that stores the set top boxidentifiers. In this case, the notification service is able to determineand insert the relevant identifiers into the notification. After thenotification is thus prepared, it is sent (312) to a broadcast servicefor transmission to the set top box.

Another aspect of the present invention is related to insuring that auser that purports to own or have access to a certain set top box is anauthorized user. Each set top box, as previously described, has a uniqueset top box identifier which may be, for example, a serial number. Theset top box identifier is signed using a key that includes two parts.The first part of the key is specific to a particular set top box and istypically hard coded into the software of the set top box. The secondpart is sent over the transmission system and stored on the set top box.

During activation of the set top box, the user is presented with anactivation code that includes the set top box identifier, a signature ofthe set top box identifier, and a random value or number. The userenters the activation code on the website and the website verifies thesignature of the set top box identifier. If the website verifies thesignature of the set top box identifier, then the random number isstored in the database maintained by the website and attached to eachsubsequent notification.

When the set top box receives a notification that is targeted to it'sset top box identifier, the set top box also verifies the random numberthat was originally generated as part of the activation code. Thisprotects against users that may try to send unauthorized notifications.In order to send an authorized notification, the user must have asignature of the set top box identifier, which is usually obtained ifthe user has physical access to the set to box. Also, the set top boxcan protect against unauthorized notifications because even if a user isable to determine the key used to sign the set top box identifier, thatuser does not have access to the random value or number that wasgenerated as part of the activation code.

The present invention may be embodied in other specific forms withoutdeparting from its spirit or essential characteristics. The describedembodiments are to be considered in all respects only as illustrativeand not restrictive. The scope of the invention is, therefore, indicatedby the appended claims rather than by the foregoing description. Allchanges which come within the meaning and range of equivalency of theclaims are to be embraced within their scope.

1. In a system that broadcasts data over a one way transmission to aplurality of set top boxes, a method for remotely scheduling a task forimplementation on a set top box, the method comprising steps for:providing program guide data to a user over a network, wherein the userrequests a task from the program guide data that is provided to theuser; receiving the task that was requested by the user from the programguide data; generating a notification from the requested task, whereinthe notification includes task attributes and a set top box identifier,as well as a sequence number that enables the set top box to determinewhether the task has already been processed; sending the notification toa notification service, wherein the notification service stores thenotification in a task database; sending, by the notification service,the notification to a broadcast service, wherein the broadcast servicesends the notification to the set top box over the one way transmission.2. A method as defined in claim 1, wherein the step for providingprogram guide data to a user over a network further comprises a step forstoring the program guide data at a website, wherein the program guidedata is obtained from a program guide data provider.
 3. A method asdefined in claim 1, wherein the step for providing program guide data toa user over a network further comprises a step for the user logging into a website that stores the program guide data with a user identifier.4. A method as defined in claim 3, wherein the step for providingprogram guide data to a user over a network further comprises a step forthe mapping a user identifier to the set top box identifier such thatthe set top box identifier is included in the notification.
 5. A methodas defined in claim 3, further comprising a step for verifying that theuser has access to the set top box, wherein the step for verifyingcomprises: providing an activation code to the website, wherein theactivation code includes the set top box identifier, a signature of theset top box identifier and a random value; the website verifying thesignature of the set top box identifier; including the random value inthe notification if the signature is verified; and verifying the randomvalue by the set top box.
 6. A method as defined in claim 1, wherein thestep for generating a notification from the selected task furthercomprises an act of determining: a channel of the task; a time of thetask; and a duration of the task.
 7. A method as defined in claim 1,wherein the step for generating a notification from the selected taskfurther comprises an act of determining the task attributes to beincluded in the notification, the task attributes including one or moreof: an extension attribute that indicates how long the task should beextended; a keep attribute that identifies how long the task should bestored; an conflict resolution attribute for use in conflict resolution;and a reminder attribute that reminds the user of the task.
 8. A methodas defined in claim 1, wherein the step for sending the notification toa notification service further comprises inserting one or more of a settop box identifier, a sequence number, and a user identifier in thenotification.
 9. A method as defined in claim 1, wherein the step forsending the notification to the broadcast service is repeated by thenotification service according to a schedule.
 10. A method as defined inclaim 9, wherein the act of providing program guide data to a user overa network, wherein the user requests a task from the program guide datathat is provided to the user further comprises one or more of:requesting a cancel task; requesting a manual record task, wherein theuser identifies a start time, an end time, and a channel to be recorded.11. A method as recited in claim 1, wherein the task attributes includea conflict resolution attribute for use in conflict resolution.
 12. Amethod as recited in claim 1, wherein the task attributes include a keepattribute that identifies how long the task should be stored.
 13. Amethod as recited in claim 1, wherein the task attributes include aconflict resolution attribute for use in conflict resolution.
 14. Amethod as recited in claim 1, wherein the task includes recording aprogram.
 15. A method as recited in claim 1, wherein the task includesdeleting a program.
 16. A method as recited in claim 1, wherein the taskincludes setting preferences.
 17. A method as recited in claim 1,wherein the task includes altering a task.
 18. A method as recited inclaim 1, wherein the task includes locking a channel.
 19. A method asrecited in claim 1, wherein the task includes locking a program.